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Deciding Between Sequential and Parallel Tasks in Engineering Design (Classic Reprint)

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9781332257232: Deciding Between Sequential and Parallel Tasks in Engineering Design (Classic Reprint)
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Excerpt from Deciding Between Sequential and Parallel Tasks in Engineering Design

Yet the division between design phases arose for valid reasons. In some industries at some times there was a benefit to have only those who created most of the value be responsible for creating the design. The inclusion of any other design issues would lead to too many people and too many concerns being involved early in the design process. It is difficult to organize complex design processes, and to achieve complete consensus among all of the players may be inefficient and expensive.

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This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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Excerpt from Deciding Between Sequential and Parallel Tasks in Engineering Design

It is generally desirable to complete design tasks in parallel in order to reduce the overall development time. However, completing tasks in parallel may sometimes increase the total amount of rework that must be done, thereby increasing the total engineering effort, the development cost and the lead time. The technique described in this paper helps to decide between serial and parallel scheduling of multiple tasks in a two-stage design process. Using information about task interdependencies, this method calculates the amount of time and the amount of effort (in engineer-weeks) required for any suggested assignment of tasks to the two stages. The paper suggests an approach for minimizing time, or effort, or both by adjusting the schedule of which tasks should be completed at which time. The method is applied to data from a computer workstation design problem.

1. Introduction

Concurrent engineering has become increasingly important in recent years. Concurrent engineering is a philosophy that suggests the need to consider design issues simultaneously where they may have been considered sequentially in the past [Nevins and Whitney 1989, Susman 1992]. The division between sequential design phases arose historically because one set of design issues (typically product performance issues) were considered of greater importance, and this portion of the design space was considered first. The secondary set of design issues (typically manufacturing process design) were considered only after the initial set of design issues had been decided ('throw it over the wall'.) In recent years the sequential design process has been considered inefficient, since this type of design process typically leads to a greater development time, greater development cost, and lower overall design quality, all of which lower the overall profit generated by the design. Concurrent engineering in its broadest definition does not only consider performance and process design issues, but many other life cycle issues (such as reliability, environmental impact, service, testing, and so forth) which have been historically neglected in the product design phase.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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